Expanding brake-band guide.



S. A. TEU..

EXPANDING BRKE BAND GUIDE.

APPLICATOH FILED APR. 4 i917.

htened Oct. 30, 19N.

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STEWBD A. TEEL, OF BANGOR, PENNSYLVANIA.

Specification of Letters Patent.

EXPANDING BRAKE-BAND GUIDE.

Patented ct. 30, 1917.

@Application led April 4, 1917. Serial No. 159,831.

To all whom t may concern i Be it known that l, STEWARD A. Tenn, a citizen ofthe United States, and a resident of Bangor, in the county of Northampton and State of Pennsylvania, have invented a new and Improved Expanding Brake-Band Guide, of which the following is a full, clear, and exact description.

This invention relates to brake hands of the expansion type', and it deals particularly with that type of brake in which the free ends of the bandvare'spread apart vby an interposed rotary cam.

The invention has for its general objects to improve brakes of this character so as to bt more reliable and eiicient in use, of durable and substantial design, and capable oi producing a more uniform gripping action on the brake drum.

A more specific object of the invention is the provision of a guide for preventing the cam in rotating from throwing one end of the brake band inwardly, whereby the cam will produce a uniform 'outward action on both ends of the brake band.

With such objects in view, and others which will appear as the description proceeds, the invention comprises various novel features of construction and arrangement of parts which will be set forth with particm larity in the following description and claims appended hereto.

In fthe' accompanying drawings,l which illustrates one embodiment of the invention and wherein similar characters 'of reference indicate corresponding parts in all the views,

Fi re 1 is a face view of a brake with the rum removed; Fig. 2 is a vertical section on the line 2 2, Fig. 1; and

Fig. 3 is a fragmentary view showing the cam in the .position to expand the brake band.

Referring tothe drawing, A designates the disk or plate of :l brake which has loosely fastened at 1 the central portion of the brake,

band 2. The ends 3 and 4 of the brake band lie at opposite sides of the band-expanding cam 5, which cam has its shaft 6 journaled in a bearing 7 of the plate A. The ends of the brake band are held toward each other and in engagement with the cam by any suitable means, such as a spring 8. When the cam turns from the position shown in Fig. 1 to that shown in Fig. 3, the end 4 of the brake band has a` tendency to be l thrown inwardly by the wiping action of the cam thereon, so that the terminal portion 4 of the brake hand will not effectively grip the brake ,drum B. To overcome this a shoulder or surface 9 is provided on the plate A, and the doubled portions of the brake band have a sliding engagement with this shoulder as the band expands and contracts. In other words, this shoulder pre` .vents the ends of the brake band from movmg inwardly, no matter which way the cam 5 is oscillated. This shoulder 9 may be.

formed by the edge of a strip of metal 10,

Figs. 1 and 2, secured by bolts 11 to the plate A, or it may be formed by a lc'dge412 cast on the plate A, as shown in Fig. 3.

From the foregoing description taken in connection with the accompanying drawing. the advantages of the construction and method of operation will be readily understood by those skilled in the art to which I the invention appertains, and while I have described the principle of operation, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is meredy illustrative and that such changes may be made when desired as fall within the scope of the appended claims. y

Having thus described my invention, l

claim as new and desire to secure by Letters Patent:

1. in a brake, the combination of a support, a brake band thereon, an actuating cam.

engaged. with the ends of the brake band, for expanding the latter, and means for preventing an inward movement of the ends of the brake band.

2. In a brake the combination of a support, a brake band thereon. an actuating cam engaged with theends of the brake band, for

expanding the latter, and means carried by,l

the support and in constant engagement with the ends of the brake band for preventing any inward movement of the ends of the brake band.

3. ln a brake, the combination of a suplos'.

engaged with the ends of the Bieke bend5 im expanding the lattel and a, guide plete earried by the supporfd and disposed et ight angles to a radial line running tiii'ougi 'the center of the eem, said guide pieee having an edge in const-ant engagement with Vthe ends of the brake band, Afor preventing the inward movement of the ends of the brake band.

5. ln e brake, the Combination of aV support, a bra-ke band thereon, an actuating eem engaged with the ends of J@he brake bend, foi" expanding the latte?, and a, guide piaee cafried by the support and disposed at iight angles to aV radiai line running thfeugb the center of the Cain, seid guide plate having en edge in constant engagement wie the ends of 1die brake bend, fe? prwenting the inward Inovernenij of theeends of the brake band, said guide piete eemned to seid support et iis ende and being ioeWed enig away from Seid suppoit, said brake band ends enga-ging the bowed portion of the guide plate.

6. In brake, the combination of a Suppoi, a brake band thereoe en aetuaing eem engaged with the ende of the brake band, for expanding the latter, a guide plate carried by the Support and disposed at right angles te iadia line running through the center of die Cairn, said guide plate having an edge in censtant engagement with the ends of'ihe Bieke band, for preventing the inward move ment oi the ends of the'biake band, seid guide plate being secured in seid suppoff ai,

its ends and being bowed oni'J away from said suppelt, seid brake band ends, engaging the bowed portion oi' die guide plete, and e spring connected Wih the ends ef the oi'ake band, for holding the ends against the Gam.

STEWB A, TEEL 

